56 THE CANADIAN ENTOMOLOGIST 



Body finely ashy pubescent. Thorax black and red marked, prothorax 

 rufous, anterior and posterior margin yellow, lateral subarcuate obsolete vitta 

 on dorsum of mesothorax and posterior calli before scutellum yellow. Scutellum 

 all red. Abdomen swollen, first segment black, narrow apical margin yellow, 

 the rest rufous, base of 2-4 fuscous, apex of 4-6 with yellow margin. Legs 

 reddish brown, unspotted. Wings fuscous hyaline, costal vitta wholly brown. 

 Squamae hyaline. 



Near the foregoing species but somewhat larger; the prothorax also has 

 the hind margin yellow, the yellow band on the side of the mesodorsum is simply 

 bowed, on the wings the light part is brownish, and the brown colour on the veins 

 reaches to the tip; the femora are entirely red, and without yellow tips. 



Thyllis obesa. 



Black, anterior and posterior margin of prothorax, sides of mesothorax, 

 scutellum and posterior part of abdominal segments yellowish, wings hyaline, 

 fuscous toward costa. Length 4 lines. 



Body finely ashy pubescent, black. Anterior and posterior margin of 

 prothorax, dorsum of mesothorax on both sides with an arcuate marginal vitta 

 and posterior calli before scutellum yellow. Scutellum black, yellow margined. 

 Abdomen swollen, each segment above with terminal belt of yellow. Legs 

 brown, femora from base to beyond middle black. Wings hyaline, costal strip 

 fuscous, abbreviated before apex, rest of costa testaceous. Squamee whitish 

 hyaline. 



In form similar to the two species above, somewhat more finely punctate 

 and in colouring without a mixture of red, therein differing from Th. crassa, 

 which also has the hind margin of the prothorax yellow and the lateral bands on 

 dorsum of thorax are simply bowed. The yellow bands on abdomen are all 

 of like size. The wings are coloured as in Th. crassa, the veins themselves are. 

 ' however, not brown, as the bands lying back of them, but brownish yellow. 



Thyllis compressa. 



Black, thorax compressed, on both sides with a longitudinal brown vitta 

 and a posterior brown spot, abdomen oblong, ferruginous, segments with basal 

 bilobed black spots. Length 3 lines. 



Head black, frons a small spot, brown. Thorax gibbous, compressed, 

 above on both sides with a longitudinal stripe, from anterior margin thence 

 gradually attenuated to base of scutellum, almost straight, reddish at termination, 

 before scutellum two small spots, oblong, marked yellow, posterior calli before 

 scutellum yellow vittate. Scutellum thick, bordered rufous, with a median 

 apical yellow spot. Abdomen as the thorax much less highly arched (than usual), 

 oblong, parallel sided, apex rounded, convex above, brown, segments with two 

 dorsal black spots confluent at base, a small intermediate spot of yellow included, 

 the lateral margin and venter all yellow. Legs yellow, femora brown, base 

 fuscous. Wings all fusco-hyaline. Squamae whitish hyaline. 



In the laterally compressed form widely differing from the foregoing species, 

 at first glance appears nearer a Philopota. 



All four species are from Cape Land. The third is in the Drege collection, 

 the others are from the material sent by Krebs. 



